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A193175 as a simple table

na(n)
14
26
38
410
512
614
716
818
920
1022
1124
1226
1328
1430
1532
1634
1736
1838
1940
2042
2144
2248
2350
2454
2560
2666
2770
2884
2990

[4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,
 38,40,42,44,48,50,54,60,66,70,84,90]